WO2020031277A1

WO2020031277A1 - Transmission device, receiving device, wireless communication system and communication method

Info

Publication number: WO2020031277A1
Application number: PCT/JP2018/029689
Authority: WO
Inventors: 下村剛史
Original assignee: 富士通株式会社
Priority date: 2018-08-07
Filing date: 2018-08-07
Publication date: 2020-02-13
Also published as: US20210160925A1; KR20210040421A; EP3826418A4; EP3826418A1; JPWO2020031277A1; CN117202401A; US11956820B2; CN112544117B; CN112544117A

Abstract

A transmission device capable of wirelessly communicating with a receiving device by using a first frequency band which does not require a license, the transmission device being equipped with: a control unit for verifying that the first frequency band is not being used by another transmission device, and shifting, in the time direction, a first symbol which includes a first control channel and a first shared channel in a first communication direction, or a second symbol which includes a second shared channel in a second communication direction which differs from the first communication direction; and a transmission unit for transmitting a first control signal and first data which are assigned to the first symbol to the receiving device by using both the first control channel and the first shared channel, or transmitting second data assigned to the second symbol to the receiving device by using the second shared channel.

Description

Transmitting device, receiving device, wireless communication system, and communication method

<< The present invention relates to a transmitting device, a receiving device, a wireless communication system, and a communication method.

In the current network, traffic from mobile terminals (smartphones and future phones) occupies most of the network resources. In addition, the traffic used by mobile terminals tends to increase in the future.

On the other hand, in line with the development of IoT (Internet of things) services (for example, monitoring systems for traffic systems, smart meters, devices, and the like), it is required to support services having various requirements. Therefore, in the communication standard of the fifth generation mobile communication (5G or NR (New @ Radio)), in addition to the standard technology of 4G (fourth generation mobile communication) (for example, Non-Patent Documents 1 to 11), There is a need for a technology that achieves high data rates, large capacity, and low delay.

Technical studies on the fifth generation communication standard are being conducted by working groups of the 3GPP (Third Generation Partnership Project) (for example, TSG-RAN WG1, TSG-RAN WG2, etc.) (Non-Patent Documents 12 to 39). .

As described above, in order to support a wide variety of services, 5G is classified into eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communication). It is intended to support many use cases.

On the other hand, in 4G, a function for performing communication in the Unlimited spectrum (or Unlimited band) which is a low frequency band (5 GHz band) is introduced. As such a function, for example, there is LTE-LAA (Long Term Evolution-Licensed Assisted Access). LTE-LAA is, for example, a technology in which a frequency band of Unlicensed @ spectrum and a frequency band of Licensed @ spectrum are bundled and used simultaneously. With LTE-LAA, for example, it is possible to realize high speed and large capacity.

In LTE-LAA, a Listen-Before-Talk (LBT) system is adopted in order to perform communication in the Unlicensed spectrum of the low frequency band (5 GHz band). In the LBT method, for example, the transmitting side performs carrier @ sensing (or carrier sense) before starting signal transmission, and confirms that the wireless channel is in the "Idle" state (no other communication is being performed). Start data transmission. By the LBT method, for example, fair coexistence between different networks such as Wi-Fi and LTE can be realized.

However, in LTE, transmission and reception based on subframe timing are fundamental. When the LBT method is used at the subframe timing, a transmission opportunity is given at the subframe timing, so that the transmission opportunity may be limited.

Therefore, in LTE-LAA, a method that allows transmission at the head timing (or head symbol) of a subframe and half the timing of a subframe (or the eighth symbol from the head symbol) is also specified. FIGS. 30A and 30B show an example thereof. Thus, for example, it is possible to increase transmission opportunities on the transmission side and prevent the transmission side and the reception side from extremely increasing the complexity of transmission / reception processing.

Note that, as shown in FIG. 30B, in the case of half the timing of the subframe, data included in TB (Transport @ Block) # 0 is transmitted from the timing of the first symbol of the subframe shown in FIG. Halved compared to when it is done. Therefore, it is also specified in 3GPP that the transmitting side halves the data before encoding included in TB # 0 and transmits the data.

On the other hand, in 5G, as in 4G, the base station determines (or schedules) radio resource allocation, an error correction coding rate, a modulation scheme, and the like, and transmits the scheduling result to the terminal. In this case, the base station transmits DCI (Downlink Control Information) including the scheduling result to the terminal using PDCCH (Physical Downlink Control CHannel). According to the scheduling result included in the DCI, the terminal uses PDSCH (Physical Downlink Shared CHannel) to extract data addressed to the own station from the received signal, or uses PUSCH (Physical Uplink Shared CHannel) to transmit data. Can be transmitted to the base station.

FIGS. 31 (A) and 31 (B) are diagrams showing resource allocation in the time direction by DCI specified in 5G. FIG. 31A shows resource allocation in the PDSCH and FIG. 31B shows resource allocation in the PUSCH in the time direction. In FIGS. 31A and 31B, for example, “S” represents the start symbol of a slot, and “L” represents the number of consecutive symbols (or length) counted from the start symbol S, respectively.

FIG. 31C illustrates an example of resource allocation (or mapping in the time direction; hereinafter, allocation and mapping may be used without distinction). For example, when S = 2 and L = 4, in one slot, the start symbol is the third symbol from the first symbol (S = 0), and the length is four symbols continuously from S = 2. It represents that. When resource allocation in the time direction is performed, in the case of PDSCH, a terminal extracts data addressed to itself using four symbols starting from S = 2.

As shown in FIG. 31 (C), in 4G, one subframe = 14 symbols (= 1 ms), but in 5G, one slot = 14 symbols. In 5G, a plurality of subcarrier intervals can be used. When the subcarrier interval is 15 kHz, 1 slot = 1 ms, and when the subcarrier interval is 30 kHz, 1 slot = 0.5 ms. The slot length changes.

In # 5G, as shown in FIG. 31A and FIG. 31B, radio resources can be allocated in the time direction in symbol units, and flexible radio resources can be allocated.

However, as described above, regarding the Unlimited band, in LTE-LAA, the transmission opportunity is a maximum of two times per subframe (= 1 ms). With a maximum of two transmission opportunities per subframe, the throughput may decrease.

技術 The disclosed technology has been made in view of the above, and aims to improve the throughput.

In one aspect, in a transmitting device capable of wireless communication with a receiving device using a first frequency band that does not require a license, it is confirmed that the first frequency band is not used by another transmitting device. , A first symbol including a first control channel and a first shared channel in a first communication direction, or a second shared channel in a second communication direction different from the first communication direction. A control unit that shifts a second symbol in a time direction; and a first control signal and a first data assigned to the first symbol are transmitted to the first control channel and the first shared channel. And a transmission unit that transmits the second data allocated to the second symbol to the receiving device using the second shared channel.

Throughput can be improved.

FIG. 1 is a diagram illustrating a configuration example of a wireless communication system. FIG. 2A is a diagram illustrating a configuration example of one slot, and FIGS. 2B and 2C are diagrams illustrating a transmission example of a TB. FIG. 3 is a diagram illustrating an example of a protocol stack. FIGS. 4A and 4B are diagrams illustrating transmission examples of PDCCCH and PDSCH. FIG. 5A is a diagram illustrating an example of an RRC message exchange sequence, and FIG. 5B is a diagram illustrating a configuration example of an RRCConfiguration message. FIG. 6 is a diagram illustrating an example of the IE included in the PDSCH-Config or the PUSCH-Config. FIGS. 7A and 7B are diagrams illustrating transmission examples of the PUSCH. FIGS. 8A and 8B are diagrams illustrating transmission examples of the PDCCH and the PDSCH. FIG. 9 is a diagram illustrating an example of information included in the PDCCH. FIGS. 10A to 10C are diagrams illustrating examples of information included in the PDCCH. FIG. 11 is a diagram illustrating an example of the NDI. FIGS. 12A to 12C are diagrams illustrating transmission examples of the PDCCH and the PDSCH. FIG. 13 is a diagram illustrating an example of the IE included in the PDSCH-Config. FIG. 14 is a diagram illustrating an example of information included in the PDCCH. FIGS. 15A and 15B are diagrams illustrating transmission examples of the PDCCH and the PDSCH. FIG. 16A is a diagram illustrating a configuration example of a base station, and FIG. 16B is a diagram illustrating a configuration example of a baseband signal processing unit. FIG. 17A is a diagram illustrating a configuration example of a terminal, and FIG. 17B is a diagram illustrating a configuration example of a baseband signal processing unit. FIG. 18 is a flowchart illustrating an operation example of the base station. FIG. 19 is a flowchart illustrating an operation example of the terminal. FIG. 20 is a flowchart illustrating an operation example of the terminal. FIG. 21 is a flowchart illustrating an operation example of the base station. FIG. 22 is a flowchart illustrating an operation example of the base station. FIG. 23 is a flowchart illustrating an operation example of the terminal. FIGS. 24A and 24B are diagrams illustrating transmission examples of the PDCCH and the PDSCH. FIG. 25 is a diagram illustrating a setting example of monitoringSymbolsWithinSlot. FIG. 26 is a diagram illustrating an example of the IE included in the PDSCH-Config or the PUSCH-Config. FIGS. 27A and 27B are diagrams illustrating monitoring examples. FIG. 28A illustrates a hardware configuration example of a base station, and FIG. 29B illustrates a hardware configuration example of a terminal. FIGS. 29A and 29B are diagrams illustrating transmission examples of the PUCCH and the PUSCH. FIGS. 30A and 30B are diagrams illustrating transmission examples of TB. FIGS. 31A and 31B are diagrams showing specifications of the start symbol and length, and FIG. 31C is a diagram showing an example of setting the start symbol and length.

Hereinafter, this embodiment will be described in detail with reference to the drawings. The problems and examples in this specification are merely examples, and do not limit the scope of the present application. In particular, even if the expressions described are different, as long as they are technically equivalent, the technology of the present application can be applied to different expressions, and the scope of rights is not limited. The embodiments can be appropriately combined within a range that does not contradict processing contents.

The terms and technical contents described in this specification may be the terms and technical contents described in specifications and contributions as communication standards such as 3GPP as appropriate. Such specifications include, for example, 3GPP {TS} 38.211@V15.1.0 (2018-03).

3GPP specifications are updated as needed. Therefore, the latest specification at the time of filing the present application may be used as the above specification. Then, terms and technical contents described in the latest specification may be appropriately used in this specification.

Hereinafter, embodiments of a base station, a terminal, a wireless communication system, and a communication method disclosed in the present application will be described in detail with reference to the drawings. Note that the following embodiments do not limit the disclosed technology.

[First Embodiment]
<1. Configuration example of wireless communication system>
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10 according to the first embodiment.

The wireless communication system 10 includes a base station device (hereinafter, may be referred to as a “base station”) 100 and a plurality of terminal devices (hereinafter, may be referred to as “terminals”) 200-1 and 200-2. Prepare.

The base station 100 performs wireless communication with the terminals 200-1 and 200-2 located in the service provision range (or cell range) of the base station 100, and provides various services such as a call service and a Web browsing service. Wireless communication device.

{Circle around (2)} The base station 100 performs the scheduling as described above, and determines the allocation of radio resources, the coding rate, the modulation scheme, and the like to each of the terminals 200-1 and 200-2. Then, base station 100 includes the scheduling result in the control signal and transmits the control signal to terminals 200-1 and 200-2 using the PDCCH. Each of the terminals 200-1 and 200-2 extracts data addressed to itself from the signal received using the PDSCH or transmits data to the base station 100 using the PUSCH according to the scheduling result included in the control signal. Can be sent.

通信 The communication direction from the base station 100 to the terminals 200-1 and 200-2 may be referred to as the down direction, and the communication direction from the terminals 200-1 and 200-2 to the base station 100 may be referred to as the up direction.

For example, in the downlink direction, the base station 100 is a transmitting device, and the terminals 200-1 and 200-2 are receiving devices. In the uplink direction, the terminals 200-1 and 200-2 are transmitting devices and the base station 100 is a receiving device. Can be

Note that the terminals 200-1 and 200-2 can also transmit a control signal in the uplink direction. In this case, the terminals 200-1 and 200-2 transmit the uplink control signal using PUCCH (Physical Uplink Control CHannel). As an example of the uplink control signal, for example, an ACK (Acknowledgement: acknowledgment) signal indicating whether or not data has been normally received or a NACK (Negative @ Acknowledgement) signal (hereinafter referred to as “ACK” or “NACK”) There is.)

The terminals 200-1 and 200-2 are wireless communication devices capable of wireless communication, such as a feature phone, a smartphone, a personal computer, a tablet terminal, and a game device. Each of the terminals 200-1 and 200-2 can receive the various services described above via the base station 100.

1 shows an example in which the base station 100 performs wireless communication with two terminals 200-1 and 200-2. For example, in the wireless communication system 10, the base station 100 may perform wireless communication with one terminal 200-1 or may perform wireless communication with three or more terminals. The number of terminals 200-1 and 200-2 may be one or a plurality.

In the first embodiment, the base station 100 and the terminals 200-1 and 200-2 can perform wireless communication using the Unlicensed @ band.

In consideration of the frequency allocation formulated by the ITU-R (International Telecommunications Radio Communications Sector) and the circumstances of each country, each country gives a license to a specific operator and allocates the frequency used in the wireless communication. . The operator can perform a mobile communication business (or a wireless communication business) by occupying a licensed frequency. The frequency band to which the operator is licensed and assigned may be referred to as, for example, Licensed @ band. On the other hand, Unlimited @ band is a frequency band that can be used without a license by a plurality of operators, for example. Unlicensed @ band is, for example, a frequency band that does not require a license, and Licensed @ band is, for example, a frequency band that requires a license. Examples of the Unlicensed band include an ISM band (Industry Science Medical band) and a 5 GHz band.

{The base station 100 and the terminals 200-1 and 200-2 confirm whether or not the frequency band can be used by using the LBT method when performing wireless communication using the Unlicensed @ band. For example, base station 100 and terminals 200-1 and 200-2 perform the following processing.

{That is, the base station 100 and the terminals 200-1 and 200-2 perform carrier sense in a usable frequency band of the unlicensed band. When the frequency band is in the “Idle” state, the base station 100 and the terminals 200-1 and 200-2 perform wireless communication using the frequency band. The “Idle” state is, for example, a state where the signal strength of the received signal is smaller than a threshold. In this case, the base station 100 and the terminals 200-1 and 200-2 confirm that the frequency band is not used by another base station or terminal, and the frequency band can be used. . On the other hand, when the frequency band is in the “Busy” state, the base station 100 and the terminals 200-1 and 200-2 do not use the frequency band. The “Busy” state is, for example, a state when the signal strength of the received signal is equal to or higher than a threshold. In this case, the base station 100 and the terminals 200-1 and 200-2 perform carrier sense again for the frequency band when a predetermined time has elapsed after confirming the "Busy" state.

The detailed operation of the carrier sense follows the method described in, for example, 3GPP TS 37.213 V15.0.0 (2018-06). Depending on the content of a signal to be transmitted, etc., a case where transmission is possible in the “Idle” state with one carrier sense and a case where transmission is possible only after the “Idle” state has passed a specified number of times are defined. In any case, the result of one carrier sense immediately before transmitting a signal must be in the “Idle” state.

The base station 100 and the terminals 200-1 and 200-2 can perform wireless communication using not only the Licensed band but also the Licensed band.

In the following, the Unlimited @ band may be described as, for example, an unlicensed band, and the Licensed @ band may be described as, for example, a license band.

端末 Also, the terminals 200-1 and 200-2 may be referred to as the terminal 200 in some cases.

Furthermore, the downlink control signal may be referred to as, for example, PDCCH. Therefore, transmitting a downlink control signal may be referred to as, for example, transmitting a PDCCH. Also, the downlink data may be referred to as, for example, PDSCH. Furthermore, for example, the uplink control signal may be referred to as PUCCH, and the uplink data may be referred to as PUSCH.

Further, in the following, the control signal and DCI may be used without distinction.

In the following, LBT and carrier sense may be used without distinction.

<2. About radio resources in the time direction>
FIG. 2A is a diagram illustrating a configuration example of one slot defined by 5G. As described above, in LTE, 14 symbols are one subframe. However, in 5G, as shown in FIG. 2A, one symbol is one slot with 14 symbols. FIG. 2A shows one slot in a certain frequency band having an unlicensed band, for example.

FIG. 2B is a diagram illustrating an example of transmission of a TB in a time direction in a frequency band having an unlicensed band.

For example, the base station 100 performs carrier sense on this frequency band and confirms that the frequency band is in the “Idle” state. Therefore, the base station 100 transmits data included in TB # a using all symbols from the first slot. ing. Then, for example, the base station 100 also transmits data of TB # b allocated to the next slot using all symbols of the next slot. The example illustrated in FIG. 2B illustrates an example in which data included in each TB is transmitted as assigned to each slot.

In the following, transmitting data included in TB, for example, transmitting TB may be referred to as transmitting.

Ｔ In FIG. 2B, the TTI is also shown. The TTI is, for example, an arrival time interval of a TB set, and represents a minimum period of a scheduling period (or cycle) allocated by one control signal transmitted using the PDCCH. Therefore, the TTI is allowed to include a plurality of TTIs by one PDCCH, for example. Although details will be described later, the example of FIG. 7A shows an example in which two TTIs are scheduled by one PDCCH.

{For example, in the example of FIG. 2B, TB # a is allocated to the first slot by one PDCCH, and TB # b is allocated to the slot next to the first slot by another PDCCH. Therefore, the first slot is one TTI, and the next slot is another TTI. For example, when two PDCCHs are assigned to different symbols in one slot, two TTIs exist in one slot.

2 (C) is a diagram showing a transmission example of TB in the time direction, similarly to FIG. 2 (B). However, the example of FIG. 2C shows an example in which the transmission start timing is shifted due to carrier sense with respect to the example of FIG. 2B.

In the example of FIG. 2C, as a result of the carrier sense, the first symbol of the first slot is in the “Busy” state. After that, carrier sense is performed, and the third symbol is in the “Busy” state. Further, thereafter, carrier sense is performed, and the state becomes “Idle”, so that signal transmission is started from the fifth symbol. In the example of FIG. 2C, the fifth symbol of the first slot (symbol 4 when symbol 0 is the first symbol) is the data transmission start timing.

When FIG. 2 (B) and FIG. 2 (C) show an example of transmission in the downlink direction, the first symbol at the transmission start timing (the first symbol in the example of FIG. 2 (B), the first symbol in FIG. 2 (C)) The PDCCH and the PDSCH are transmitted using the fifth symbol in the example). In 5G, unlike 4G, PDCCH and PDSCH can be assigned to one symbol. In this case, the transmission illustrated in FIGS. 2B and 2C is performed by, for example, the base station 100.

2) In addition, when FIGS. 2B and 2C show an example of transmission in the uplink direction, the PUCCH and PUSCH are transmitted using the first symbol at the transmission start timing. In this case, the transmission illustrated in FIGS. 2B and 2C is performed by, for example, the terminal 200.

On the other hand, as shown in FIG. 2B, a total of 14 symbols in one slot are allocated to TB # a. In the example shown in FIG. 2 (C), transmission starts from the fifth symbol. Therefore, in the first slot, data for 10 symbols included in TB # a can be transmitted, but data for the remaining 4 symbols is transmitted. Data cannot be sent. In this case, in the example of FIG. 2C, data of the remaining four symbols included in TB # a, which could not be transmitted in the first slot, is transmitted using the first four symbols of the next slot. .

Therefore, the data of 14 symbols included in TB # a is transmitted using 10 symbols of the first slot and 4 symbols of the next slot. In this case, the first slot and the next slot are, for example, resources in the time direction allocated by different PDCCHs. In this case, the data of TB # a is allocated resources in the time direction across two slots allocated by different PDCCHs. For example, since the scheduling period assigned by one PDCCH is one TTI, data of TB # a is transmitted to the same terminal 200 across two TTIs.

If all the data cannot be transmitted in the first slot (or the first TTI) due to the carrier sense, the transmission of the data part that could not be transmitted in the next TTI is performed by, for example, “Cross @ TTI” (or cross TTI). ). Alternatively, the cross TTI means, for example, that the same data is transmitted across a plurality of TTIs. For example, in FIG. 2C, since TB # a could not be transmitted in the first TTI, it is transmitted in the next TTI and is transmitted in the cross TTI.

The cross TTI can be set by, for example, an RRC (Radio Resource Control) message or PDCCH. Details will be described later.

As described above, in the first embodiment, for example, as shown in FIG. 2C, a symbol including the PDCCH and the PDSCH or a symbol including the PUCCH and the PUSCH can be shifted in the time direction. . Accordingly, as shown in FIG. 2 (C), not only the first symbol (first symbol) and its intermediate symbol (eighth symbol from the first symbol) in the slot as in LTE-LAA, but also other symbols as shown in FIG. Data transmission is possible even from symbols. Therefore, in the first embodiment, the transmission opportunity is increased as compared with the case where data is transmitted from the first symbol in the slot and its intermediate symbol, so that the throughput can be improved.

In the first embodiment, data addressed to the same terminal 200 is transmitted by the cross TTI. In this case, as shown in the example of FIG. 2 (C), the transmission side does not wait for ACK or NACK, and in the next TTI (or next slot) after the first TTI (or slot), the transmission side uses The remaining data of TB # a that could not be transmitted is being transmitted. Therefore, since the transmission device can transmit data without waiting for ACK or NACK, it is possible to improve the throughput as compared with a case where transmission is performed after waiting for ACK or NACK.

In the first embodiment, the transmitting side transmits a signal that could not be transmitted in the first slot due to carrier sense in the next slot as it is. Compared to the case where a certain process is performed on the signal, the first embodiment transmits the signal as it is, so that it is possible to reduce the complexity of the transmission process on the transmission side and the reception process on the reception side. Become.

Hereinafter, the first embodiment will be described in different cases. First, the relationship between the RRC message and the PDCCH will be described. Next, as a specific example, 1) a case where a cross TTI is set by an RRC message when the PDCCH and the PDSCH are shifted will be described. Next, 2) a case where a cross TTI is set from the RRC message when the PUSCH is shifted will be described. Next, 3) a case where a cross TTI is set by the PDCCH when the PDCCH and the PDSCH are shifted will be described.

As shown in FIG. 2B, all symbols in the slot are allocated to TB # b in the slot next to the first slot. In this case, as shown in FIG. 2C, the transmitting apparatus cannot transmit data for four symbols of TB # b in the slot next to the first slot due to the cross TTI of TB # a. In this case, the transmitting apparatus can further transmit the data for four symbols that could not be transmitted using the next slot (the next slot following the first slot). The transmitting apparatus can also transmit TB # b in the cross TTI.

{Circle around (2)} In the example shown in FIG. 2 (C), an example in which carrier sense is performed every two symbols is described, but it may be performed every one symbol or every three or more symbols.

<3. Relationship between RRC message and PDCCH>
FIG. 3 is a diagram illustrating an example of a protocol stack between the base station 100 and the terminal 200 in 5G. As shown in FIG. 3, the PDCCH is included in the lowest physical layer (PHY), and the RRC message is included in an RRC layer higher than the physical layer.

The PDCCH is transmitted, for example, for each TTI. Therefore, the PDCCH has a larger overhead than the RRC message, but can change the control in real time and has flexibility.

On the other hand, the RRC message is transmitted, for example, every several hundred ms. Therefore, the RRC message has less overhead than the PDCCH, but it is difficult to change the control in real time, and the RRC message is less flexible.

It can be said that the PDCCH and the RRC message have a trade-off relationship with respect to overbed and flexibility, for example.

<4.1 When Cross PTI is Set by RRC Message when PDCCH and PDSCH Shift>
FIGS. 4A and 4B are diagrams illustrating transmission examples of the PDCCH and the PDSCH.

In the example of FIG. 4A, the base station 100 allocates data included in TB # a to all symbols in the first slot in the downlink direction by scheduling, and assigns data to all symbols in the slot next to the first slot. On the other hand, data of TB # b is allocated. Further, in the example of FIG. 4A, the PDCCH is allocated to the first and second symbols at the head. In 5G, PDCCH is allowed from 1 symbol length to 3 symbol length. Therefore, the PDCCH may be included only in the first symbol, or may be included in the first to third symbols.

In the example of FIG. 4A, the base station 100 performs carrier sense in the unlicensed band and confirms that the base station 100 is in the “Idle” state at the time of the first symbol of the first slot. The PDCCH #a and the PDSCH (TB #a) assigned to each symbol are transmitted in order. The base station 100 also transmits PDCCH # b and PDSCH (TB # b) assigned to each symbol in the slot next to the first slot in order from the first symbol.

4 On the other hand, in the example of FIG. 4B, the base station 100 performs carrier sense in the unlicensed band, and confirms that it is in the “Busy” state at the time of the first symbol of the first slot. Therefore, base station 100 also does not transmit PDCCH #a and PDSCH (TB #a), and also subsequent PDCCH #b and PDSCH (TB #b) at this timing.

The base station 100 performs the carrier sense again after a lapse of a predetermined time after the first carrier sense (after a lapse of two symbol times in the example of FIG. 4A), and at the time of the third symbol of the first slot. , "Busy" state. Therefore, the base station 100 does not perform transmission at this point.

{Circle around (2)} After a lapse of a predetermined time after performing the second carrier sensing, the base station 100 performs the carrier sensing again and confirms the “Idle” state at the time of the fifth symbol of the first slot. Therefore, base station 100 transmits PDCCH # a and PDSCH (TB # a) with the timing of the fifth symbol as the transmission start timing. In this case, the base station 100 transmits, for TB # a, data allocated to ten symbols from the fifth symbol to the fourteenth symbol in the first slot. Therefore, of the TB # a allocated to all symbols in the first slot, the remaining four symbols of TB # a allocated to the eleventh to fourteenth symbols are not transmitted in the first slot.

基地 Then, base station 100 transmits TB # a for the remaining four symbols using the cross TTI. That is, in the example of FIG. 4 (B), base station 100 uses the last four symbols (the eleventh to fourteenth symbols) of the next slot to transmit TB # a for the remaining four symbols that have not been transmitted. Send In this case, base station 100 transmits the data of the remaining four symbols using the last four symbols of the next slot without receiving ACK or NACK from terminal 200.

In the DCI transmitted using the PDCCH, a start symbol S and a continuous length from the start symbol (hereinafter, sometimes referred to as “length”) are used as resource allocation in the time direction of the PDSCH. L. In the example of FIG. 4A, DCI including S = 0 and L = 14 is transmitted using the PDCCH.

In the first embodiment, even when there are a plurality of transmission opportunities due to carrier sense, the base station 100 makes the contents of the start symbol S and length L included in DCI the same. Accordingly, base station 100 transmits PDCCH #a from the first symbol as shown in FIG. 4A, and PDCCH #a from the fifth symbol as shown in FIG. 4B. , The start symbol S and the length L both transmit DCI including S = 0 and L = 14.

In this case, in the example of FIG. 4A, the terminal 200 can receive all of the PDCCH and PDSCH of S = 0 and L = 14. However, in the example of FIG. 4B, terminal 200 has not received PDDCH and PDSCH at the time of S = 0. In addition, when one slot time ends, terminal 200 has not received PDSCH for a length of L = 14. That is, terminal 200 can use the start symbol S and length L to know that there is an insufficient PDSCH. In this case, terminal 200 interprets the insufficient PDSCH as “untransmitted”. Details will be described in an operation example.

In the first embodiment, the start symbol S is defined as, for example, a symbol that can actually start transmission of a transmission burst. For example, in the example of FIG. 4A, transmission of a transmission burst starts from the first symbol (symbol 0) in one slot, and in the example of FIG. 4B, the transmission burst starts from the fifth symbol (symbol 4). Transmission of transmission burst has started. In this case, in each case, the start symbol S is S = 0.

Next, an example of setting a cross TTI using an RRC message will be described.

FIG. 5A is a diagram illustrating an example of exchange of RRC messages. In FIG. 5A, for example, UE (User @ Equipment) corresponds to the terminal 200, and Network corresponds to the base station 100.

The base station 100 transmits an RRCReconfiguration message to the terminal 200 (S10). On the other hand, upon receiving the RRCReconfiguration message, the terminal 200 transmits an RRCReconfigurationComplete message to the base station 100 (S11).

FIG. 5B is a diagram illustrating a configuration example of the RRCReconfiguration message. The RRCReconfiguration message includes various contents in a hierarchical structure, and a part of the message includes a PDSCH-Config and a PUSCH-Config.

PDSCH-Config is used, for example, to set UE-specific PDSCH parameters. Further, the PUSCH-Config is used, for example, to set PUSCH parameters for each UE. Details of the information element (IE: Information @ Element) included in each of PDSCH-Config and PUSCH-Config are described in 3GPP \ TS \ 38.331 \ V15.1.0 (2018-03).

In the first embodiment, the base station 100 transmits the PDSCH-Config further including the IE for implementing the cross TTI.

FIG. 6 is a diagram illustrating an example of the IE included in the PDSCH-Config. The IE includes (1) whether or not to perform a cross TTI, (2) a slot number for transmitting an untransmitted portion, (3) a symbol number for starting transmission, and (4) an end symbol of a slot next to the first slot. Further, whether or not to shift in the next slot is included.

(1) “Whether or not to perform cross TTI” indicates, for example, whether or not to transmit data across TTIs (or using a plurality of TTIs) and can be expressed by 1 bit.

「(2)“ slot number for transmitting untransmitted portion ”indicates, for example, when transmitting the PDSCH of the untransmitted portion by cross TTI, the slot number of the slot used for the transmission. In the example of FIG. 4B, since the untransmitted portion of TB # a (data for the remaining four symbols) is transmitted in the slot next to the first slot, if the slot number of the first slot is “0”, The “slot number for transmitting the untransmitted portion” is “1”.

The “symbol number to start transmission” in (3) represents, for example, the symbol number of the symbol to start transmission in the slot of the slot number to transmit the untransmitted part in (2). For example, in the example of FIG. 4B, transmission starts from the eleventh symbol, and thus the symbol number for starting transmission is “10”.

The symbol number for starting the transmission in (3) is divided into cases as shown in FIG. This is because, for example, when the base station 100 performs the carrier sense, the timing at which transmission can be started may not be known without actually performing the transmission. As described above, the terminal 200 can interpret the PDSCH of the untransmitted portion as “untransmitted” from the start symbol S and the length L, the actually received data, and the like. It is possible to grasp whether or not there is a shortage. Then, terminal 200, according to (2) “slot number for transmitting untransmitted portion” and (3) “symbol number for starting transmission” included in PDSCH-Config, displays the symbol in the slot. , It is possible to receive the data of the untransmitted portion.

「(4)“ Whether or not to shift the end symbol of the slot next to the first slot to the next slot ”represents, for example, the following. That is, the base station 100 transmits an untransmitted portion in the next slot (or TTI) at the head by the cross TTI. However, this reduces the number of symbols to which data to be transmitted is allocated in the next slot at the head, and prevents base station 100 from transmitting this data. In the example of FIG. 4B, a portion where data of TB # b allocated to all symbols of the slot next to the first slot cannot be transmitted due to the cross TTI of TB # a occurs. Therefore, according to (4), an IE indicating whether to shift to the next slot is further added to the PDSCH-Config. In the example of FIG. 4B, the end symbol of the untransmitted portion of TB # b is not further shifted to the next slot (the third slot from the head). In this case, “whether the end symbol of the slot next to the first slot is shifted to the next slot” is “0” (= not shifted). When shifting, for example, this IE is “1”.

Note that the example of (3) “symbol number for starting transmission” shown in FIG. 6 is an example. For example, when one symbol is insufficient, the “symbol number to start transmission” may be “1”, when two symbols are insufficient, “2”, and the like.

<4.2 When PUSCH is shifted, cross TTI is set by RRC message>
FIGS. 7A and 7B are diagrams illustrating transmission examples of the PUSCH.

As shown in FIG. 7 (A), base station 100 allocates TB # a to all symbols of the first slot in the uplink direction and allocates TB # b to all symbols of the next slot by scheduling. Sending the assignment result.

In the example of FIG. 7A, terminal 200 performs carrier sense in the unlicensed band and confirms the “Idle” state at the time of the first symbol in the first slot, so that PDCCH is sequentially performed from the first symbol. In accordance with the above, the PUSCH (TB # a) is transmitted. Then, even in the next slot, terminal 200 transmits PUSCH (TB # b) in order from the first symbol.

{On the other hand, in the example of FIG. 7B, the terminal 200 performs carrier sense in the unlicensed band and confirms that the terminal 200 is in the “Busy” state at the time of the first symbol of the first slot. Therefore, after a predetermined period has elapsed, terminal 200 again performs carrier sense in the unlicensed band, and confirms that the terminal is in the “Busy” state even at the time of the third symbol. Further, after a predetermined period has elapsed, terminal 200 performs carrier sense again in the unlicensed band, and confirms the “Idle” state this time. Terminal 200 transmits the PUSCH (TB # a) with the start time of the fifth symbol as the transmission start timing. Terminal 200 transmits the transmission start timing of TB # a by shifting it.

In this case, for terminal TB # a, terminal 200 transmits data allocated to ten symbols from the fifth symbol to the fourteenth symbol in the first slot in the first slot. Therefore, terminal 200 cannot transmit, in the first slot, TB # a of the remaining four symbols allocated to eleventh to fourteenth symbols among TB # a allocated to all symbols in the first slot. .

{Then, terminal 200 transmits TB # a for the remaining four symbols using the cross TTI. That is, in the example of FIG. 7 (B), terminal 200 uses the first four symbols (first to fourth symbols) of the next slot to transmit TB # a for the remaining four symbols that have not been transmitted. Send.

Then, similarly to the terminal 200 in the downlink direction, the base station 100 can grasp that there is an insufficient PUSCH based on the start symbol S and the length L. For example, in the example of FIG. 7B, the base station 100 receives only 10 symbols of data from the terminal 200 despite transmitting S = 0 and L = 14 by PUCCH. If it is detected that there is no PUSCH, it is possible to grasp that there is an insufficient PUSCH. In this case, the base station 100 interprets the insufficient PUSCH as “untransmitted”.

Next, an example of setting a cross TTI using an RRC message will be described.

FIG. 6 shows an example of the IE of the PUSCH-Config included in the RRCReconfiguration message. In the PUSCH-Config as well as the PDSCH-Config, each IE is specified in 3GPP TS 38.3GPP TS 38.331 V15.1.0 (2018-03). In the first embodiment, the IE shown in FIG. 6 is further included in the PUSCH-Config in order to set the cross TTI.

よう As shown in FIG. 6, the IE is the same as the IE of PDSCH-Config, and the content thereof is also the same.

For example, in the example of FIG. 7B, “1” (= cross TTI is performed) is “1” (= cross TTI is performed), and “2. "1" (the next slot if the first slot is "0"). Further, the “symbol number to start transmission” in (3) is “0”, and the “shift to next slot” in (4) is “1” (= shifted).

Terminal 200 receives the RRCReconfiguration message from base station 100, as shown in FIG. 5 (A) (S10, S11). Then, the RRCReconfiguration message includes the IE related to the cross TTI as shown in FIG. According to this IE, terminal 200 transmits data for the remaining four symbols of TB # a using the first to fourth symbols of the slot next to the first slot, as shown in FIG. 7B. . In this case, with respect to the data of TB # b, the data assigned to the eleventh to fourteenth symbols is “not transmitted”. The terminal 200 shifts the data of the “untransmitted” portion to the next slot (next slot after the first slot) according to IE (4) shown in FIG. 6 and transmits the data by the cross TTI.

FIG. 29 (A) and FIG. 29 (B) show an example in the case of transmitting PUCCH and PUSCH. FIGS. 29A and 29B show examples in which PUCCH is added to the examples in FIGS. 7A and 7B, respectively. The PUCCH is added to the PUSCH or not added to the PUSCH, for example, by DCI.

送信 The transmission examples of FIGS. 29A and 29B can be implemented, for example, as in the cases of FIGS. 7A and 7B, respectively. In this case, as shown in FIG. 29B, terminal 200 transmits the PUCCH and PUSCH in the time direction with the fifth symbol as the transmission start timing, compared to the case of FIG. 29A. Will do.

<4.3 When Cross TTI is Set by PDCCH when PDCCH and PDSCH Shift>
FIGS. 8A and 8B are diagrams illustrating transmission examples of the PDCCH and the PDSCH.

In the example of FIG. 8A, since the unlicensed band is in the “Idle” state at the time of the first symbol of one slot, the base station 100 sequentially assigns TB # a allocated to all symbols of the first symbol. Send. Also, base station 100 sequentially transmits TB # b allocated to all symbols in the slot next to the first slot.

On the other hand, in the example of FIG. 8 (B), the base station 100 is in the “Busy” state at the time of the first symbol and the third symbol of the first slot, so the base station 100 suspends transmission of Tb # a. Since the base station 100 is in the “Idle” state at the time of the fifth symbol, it starts transmitting TB # a. In this case, base station 100 could not transmit the last four symbols in the first slot among TB # a transmitted in the first slot. Therefore, the base station 100 uses the fifth to eighth symbols in the next slot (or TTI) in the next slot (or TTI) by using the cross TTI, for the remaining four symbols of “untransmitted” TB # a. Transmitting data.

では In this example, the cross TTI is set by the PDCCH.

FIG. 9 is a diagram illustrating an example of an area (field) included in DCI transmitted using the PDCCH.

As shown in FIG. 9, DCI includes TDRA (Time @ Domain @ Resource @ Assignment), NDI (New @ Data @ Indicator), HARQ (Hybrid @ Automatic @ Repeat @ reQuest) process number (HARQ @ Process @ number). Further, the new PDCCH includes RV (Redundancy Version), MCS (Modulation and Coding Scheme), and FDRA (Frequency Domain Resource Assignment).

TDRA indicates, for example, resource specification in the time direction, and includes a start symbol S and a length L in a slot. The start symbol S is defined as, for example, a symbol that can actually start transmission of a transmission burst, similarly to the above <4.1>. When there are a plurality of transmission opportunities, base station 100 sets start symbol S and length L to the same value.

FIG. 10A is a diagram illustrating an example of DCI included in PDCCH #m in the examples of FIGS. 8A and 8B. As shown in FIG. 10A, start symbol S and length L included in PDCCH #m in FIG. 8A, and start symbol S and length L included in PDCCH #m in FIG. Are both S = 0 and L = 14.

Returning to FIG. 9, the NDI is used, for example, in the same retransmission process (HARQ) as the current NDI to identify retransmission data or new data by comparing with the previous NDI.

FIG. 11 is a diagram illustrating an example of using NDI.

Focusing on TB # a, base station 100 first transmits “0” as NDI, and retransmits TB # a because NACK is returned from terminal 200. In this case, the base station 100 transmits “0” represented as NDI again without performing Toggle (or bit inversion) as NDI. The terminal 200 can recognize that the received TB # a is retransmission data because the NDI bit is not toggled.

{Circle around (2)} When terminal 200 returns ACK due to normal reception of TB # a, base station 100 transmits TB # a ′ different from TB # a as new data. In this case, the base station 100 toggles the bit “0” of the NDI and transmits “1”. Since the terminal 200 has received “1” as the NDI, it can recognize that TB # a ′ is new data.

Returning to FIG. 9, the HARQ process number indicates, for example, an identification number of a buffer for each TB that stores the TB. For example, in the same retransmission process, when the HARQ process numbers are the same, they represent the same TB, and when they are different, they represent different TBs.

RV represents, for example, the version of the encoded data. By changing the version of the coded data for each retransmission, the coding gain on the receiving side can be improved. When transmitting retransmission data in the same retransmission process, base station 100 transmits an RV different from the previously transmitted RV, so that terminal 200 can improve the coding gain for the retransmission data. .

In the first embodiment, a new PDCCH (PDCCH # n in the example of FIG. 8B) is used for setting a cross TTI, and an “untransmitted” portion of the PDSCH is determined by the NDI, HARQ process number, and RV. Is transmitted.

FIG. 10B is a diagram showing an example of DCI included in PDCCH # n which is a new PDCCH in the example of FIG. 8B. Note that in the example of FIG. 8B, TB # a for the remaining four symbols is the fourth symbol in the slot next to the first slot as the transmission start symbol and its length is four symbols. The TDRA of PDCCH #n shown in FIG. 10 (B) is S = 4, L = 4.

ＮAs shown in FIG. 10B, the NDI included in PDCCH #n and the NDI included in PDCCH #m shown in FIG. 10A are the same “0”. Also, the HARQ process number included in PDCCH #n and the HARQ process number included in PDCCH #m are the same “5”.

As shown in FIG. 10 (A) and FIG. 10 (B), the same TB (TB # a) is transmitted in the same retransmission process because the HARQ process numbers of PDCCH #n and PDCCH #m are the same. It represents that it is. Also, although the NDIs of PDCCH #n and PDCCH #m are the same, the RVs of PDCCH #n and PDCCH #m are the same, indicating that, for example, retransmission is not performed.

That is, by making the NDI, HARQ process number, and RV of PDCCN #n and PDCCH #m the same, it is possible to represent the transmission of the "untransmitted" portion of the same PDSCH.

In the first embodiment, the transmission of the “untransmitted” portion is represented by the DCI by changing the usage without changing the definitions of the NDI, the HARQ process number, and the RV. Is possible.

In the examples of FIGS. 8A and 8B, the DCI of PDCCH # m1 instructing transmission of TB #b is represented, for example, by FIG. 10C. As shown in FIG. 10 (C), the HARQ process number is different from PDCCH # m transmitted in the first slot (FIG. 10 (A)). Therefore, it indicates that the base station 100 is transmitting a TB (TB # b in FIG. 8A) different from the TB transmitted in the first slot (TB # a in FIG. 8A).

Three transmission examples have been described above.

<5. Others>
Next, other examples will be described.

<5.1 Example of Notifying Ending Symbol>
Next, an example of notifying the Ending Symbol will be described.

FIG. 12 (A) is a diagram illustrating a transmission example of the PDCCH and the PDSCH.

In FIG. 12A, since the head symbol of the head slot is in the “Idle” state, TB # a is transmitted using four symbols from the head, and TB # b is transmitted using the fifth and subsequent symbols. An example is shown. FIG. 12A shows an example of a minislot specified in 5G.

Ｔ The TDRA of PDCCH #n has, for example, a start symbol S = 0 and a length L = 7, and the TDRA of PDCCH # m1 has, for example, a start symbol S = 0 and a length = 14.

FIG. 12B shows that the unlicensed band is in the “Busy” state at the time of the first symbol and the third symbol of the first slot, so transmission is suspended, and at the time of the fifth symbol, “Idle” This shows an example of a state. Therefore, base station 100 transmits PDCCH #n, PDCCH # n1, and TB #a with the fifth symbol as the transmission start position.

In this case, in TB # a assigned to the first to seventh symbols of the first slot in the first slot, data for three symbols, which are part of TB # a, is transmitted in the first slot. Therefore, data for four symbols of TB # a allocated to the fourth to seventh symbols of TB # a cannot be transmitted using the fifth to seventh symbols of the first slot.

In such a case, the eighth to eleventh symbols in the first slot are used for transmitting data of four symbols of TB # a, which is an “untransmitted” portion, or are indicated by PDCCH # m1. As described above, it cannot be grasped whether or not it is used for transmitting TB # b. Moreover, in PDCCH # n, start symbol S = 0 and length L = 7, and in PDCCH # m1, start symbol S = 0 and length L = 14. With only S and length L, it is not possible to grasp how to handle such a case.

Therefore, in the first embodiment, “Ending @ Symbol” is newly defined. Ending @ Symbol represents, for example, an end symbol in a slot. However, how to count Ending @ Symbol is, for example, by setting the symbol at the beginning of the slot to “0” and counting in order from the beginning.

{For example, when Ending @ Symbol = 6, it indicates that the transmission of the PDSCH is terminated by the seventh symbol counted from the first symbol at the beginning of the slot. In the example of FIG. 12B, when Ending @ Sybol = 6 with respect to TB # a, the transmission of the data of TB # a ends by the seventh symbol in the first slot. Therefore, in the example of FIG. 12B, the eighth to fourteenth symbols are used for transmission of TB # b. On the other hand, in the example of FIG. 12B, when “Ending @ Symbol = 13”, “untransmitted” data of TB # a indicates that transmission is to be completed from the 8th to 14th symbol of the first slot. I have. Therefore, the example of FIG. 12B indicates that untransmitted data of TB # a is transmitted using the eighth to fourteenth symbols of the first slot. In the example of FIG. 12B, untransmitted data of TB # a is transmitted using the eighth to eleventh symbols.

Ending @ Symbol is, for example, “6” when S <6, “13” otherwise, and determines whether to shift the “untransmitted” portion of data to another TTI and transmit it. It can be said that it represents.

<< Ending >> Symbol may also be set by the RRCReconfiguration message or may be set by the PDCCH.

FIG. 13 shows an example of setting Ending @ Symbol by an RRC message.

示す As shown in FIG. 13, the IE of “Ending @ Symbol” is newly included in the PDCH-Config included in the RRCReconfiguration message. The base station 100 inserts an end symbol into this IE and transmits it to the terminal 200 (for example, FIG. 5A).

例 The example shown in FIG. 13 shows an example in which Ending @ Symbol = 6 when the start symbol S <6, and Ending @ Symbol = 13 in other cases. That is, when the start symbol S becomes the first to seventh symbols due to the carrier sense, the transmission of the TB # a assigned to these symbols is finished by the seventh symbol. Also, when the start symbol S changes from the eighth to the fourteenth symbol due to the carrier sense, the transmission of TB # a is ended by the fourteenth symbol.

FIG. 14 shows an example in which Ending @ Symbol is set by the PDCCH.

領域 As shown in FIG. 14, an “Ending @ Symbol” area is newly included, and base station 100 inserts an end symbol in this area and transmits the PDCCH. In this case, since the length L included in the TDRA can be calculated as L = ES + 1, the length L need not be included in the TDRA. Further, information of “Ending @ Symbol” may be included in the TDRA area.

As shown in FIG. 12 (C), the PDCCH may be allocated to the eighth to tenth symbols of the first slot. In this case, base station 100 uses this PDCCH to determine whether or not to receive data for four “untransmitted” symbols of TB # a in the eighth to fourteenth symbols (or whether to permit shifting). ) May be transmitted. Alternatively, the base station 100 may insert such information into the PDSDH-Config and set the information in the RRC message.

<< Ending >> Symbol can also be used in transmission of PUCCH and PUSCH. In this case, the base station 100 can set Ending @ Symbol using, for example, the PUSCH-Config illustrated in FIG.

<5.2 Example when PDSCH cannot be mapped in PDCCH mapping area>
In 5G, for example, it is possible to transmit a PDCCH using a certain symbol and transmit a PDSCH using the symbol. Alternatively, for example, it is possible to map and transmit the PDSCH to the symbol to which the PDCCH is mapped.

FIGS. 15A and 15B show transmission examples of PDCCH and PDSCH.

FIG. 15A shows an example in which base station 100 transmits PDCCH #m and TB #a in the first slot, and transmits PDCCH # m1 and TB #b in the next slot.

On the other hand, in FIG. 15B, in the first slot, transmission starts from the fifth symbol, and TB # a uses the first slot (or the first TTI) and the next slot (or the next TTI) by the cross TTI. This is an example of transmission. In this case, base station 100 allocates two PDCCH # m1 and PDCCH #n to the first and second symbols of the slot next to the first slot, and further allocates PDSCH to these two symbols.

In this case, in the area of the two symbols, the area of the radio resource to which the PDSCH is allocated may include the area of the radio resource to which the PDCCH (PDCCH # m1 and PDCCH #n) is allocated.

In the first embodiment, the base station 100 punctures coded bits to be mapped to the PDCCH region in the PDSCH including the PDCCH region. That is, when the PDCCH is included in the PDSCH area, the base station 100 transmits the PDCCH with priority over the PDSCH. Furthermore, the base station 100 does not transmit (or punctures) the coded bits in the area of the radio resource where the PDCCH and the PDSCH overlap. Thereby, for example, the receiving-side terminal 200 can avoid receiving data and control signals at the same timing using the same frequency, and can normally receive data and control signals. It becomes possible.

<6. Configuration example of base station and terminal>
FIG. 16A is a diagram illustrating a configuration example of the base station 100. The base station 100 includes a transmission path interface 110, a baseband signal processing unit 120, an RF (Radio Frequency) transmitting / receiving unit (or a transmitting unit or a receiving unit) 130, and an antenna 140. The base station 100 may be, for example, a gNB (Next generation Node B) defined in 5G.

(4) The transmission line interface 110 receives packet data transmitted from an upper station or another base station, and extracts data and the like from the received packet data. The transmission line interface 110 outputs the extracted data to the baseband signal processing unit 120. Further, the transmission line interface 110 receives data output from the baseband signal processing unit 120, generates packet data including the input data, and transmits the generated packet data to an upper station or another base station. I do.

The baseband signal processing unit 120 performs, for example, processing on data in a baseband.

FIG. 16B is a diagram illustrating a configuration example of the baseband signal processing unit 120. The baseband signal processing unit 120 includes a reception signal processing unit 121, a control unit 122, a PDCCH generation unit 123, a PDSCH generation unit 124, and a mapping unit 125.

The received signal processing unit 121 receives, for example, data (PUSCH) transmitted from a certain terminal 200 and control based on the baseband signal output from the RF transmitting / receiving unit 130 according to the uplink scheduling result output from the control unit 122. A signal (PUCCH) is extracted. The reception signal processing unit 121 outputs the extracted data, control signal, and the like to the control unit 122.

The control unit 122 performs scheduling when performing wireless communication with the terminal 200, for example, and outputs the scheduling result to the PDCCH generation unit 123. In this case, the scheduling result output to PDCCH generating section 123 includes the respective scheduling results in the downlink and uplink directions. Control section 122 outputs the downlink scheduling result to mapping section 125 and the uplink scheduling result to reception signal processing section 121, respectively.

(4) The control unit 122 outputs the data output from the transmission line interface 110 to the PDSCH generation unit 124.

(4) Further, the control unit 122 generates an RRC message and outputs the generated RRC message to the PDSCH generation unit 124. The RRC message includes, for example, an RRCReconfiguration message, and also includes a PDSCH-Config and a PUSCH-Config shown in FIGS.

PDCCH generating section 123 generates DCI including the scheduling result from the scheduling result output from control section 122. The PDCCH generation unit 123 generates, for example, the DCI shown in FIG. 9 and FIG. However, the information included in each IE of the DCI may be generated in, for example, the control unit 122. In this case, the PDCCH generation unit 123 collects the information and collects the information of one DCI shown in FIG. 9 or FIG. The DCI may be generated to be in the form. PDCCH generating section 123 outputs the generated DCI to mapping section 125.

PDSCH generating section 124 outputs the data output from control section 122 to mapping section 125. In this case, the PDSCH generation unit 124 may output this data as a PDSCH, for example. Further, PDSCH generating section 124 outputs the RRC message output from control section 122 to mapping section 125.

The mapping unit 125 maps the control signal output from the PDCCH generation unit 123 and the data output from the PDSCH generation unit 124 to a predetermined area on the radio resource according to the downlink scheduling result output from the control unit 122. Map. Mapping section 125 outputs the mapped control signal and data to RF transmitting / receiving section 130.

{Mapper 125, for example, maps the RRC message output from PDSCH generator 124 to a predetermined area on the radio resource, and outputs the mapped RRC message to RF transceiver 130.

Returning to FIG. 16A, the RF transmitting / receiving section 130 performs frequency conversion of the control signal and data output from the baseband signal processing section 120 and the RRC message into a radio signal of a radio band, and performs frequency conversion. The wireless signal is output to antenna 140.

(4) The RF transmitting / receiving unit 130 performs frequency conversion of the radio signal output from the antenna 140 to a baseband signal of a baseband, and outputs the baseband signal after the frequency conversion to the baseband signal processing unit 120.

Antenna 140 transmits the radio signal output from RF transmitting / receiving section 130 to terminal 200. In addition, antenna 140 receives a wireless signal transmitted from terminal 200 and outputs the received wireless signal to RF transmitting / receiving section 130.

FIG. 17A is a diagram illustrating a configuration example of the terminal 200.

The terminal 200 includes an antenna 210, an RF transmitting / receiving unit (or a transmitting unit or a receiving unit) 220, a baseband signal processing unit 230, and an application unit 240.

Antenna 210 receives a radio signal transmitted from base station 100 and outputs the received radio signal to RF transmitting / receiving section 220. Further, antenna 210 transmits the radio signal output from RF transmitting / receiving section 220 to base station 100.

RF transmitting / receiving section 220 performs frequency conversion on the radio signal output from antenna 210 to convert the signal into a baseband signal, and outputs the converted baseband signal to baseband signal processing section 230. Further, RF transmitting / receiving section 220 performs frequency conversion of the baseband signal output from baseband signal processing section 230 to a wireless signal in a wireless band, and outputs the converted wireless signal to antenna 210.

The baseband signal processing unit 230 performs, for example, processing on a baseband signal.

FIG. 17B is a diagram illustrating a configuration example of the baseband signal processing unit 230.

The baseband signal processing unit 230 includes a PDCCH reception processing unit 231, a PDSCH reception processing unit 232, a control unit 234, a PUSCH generation unit 235, a PUCCH generation unit 236, and a mapping unit 237.

PDCCH reception processing section 231 extracts a control signal from the baseband signal output from RF transmission / reception section 220. PDCCH reception processing section 231 outputs the downlink scheduling result among the extracted control signals to PDSCH reception processing section 232, and outputs the uplink scheduling result to control section 234.

PDSCH reception processing section 232 extracts data and RRC messages assigned to its own station from the baseband signal output from RF transmission / reception section 220 according to the downlink scheduling result output from PDCCH reception processing section 231.

At this time, for example, the PDSCH reception processing unit 232 confirms whether or not data has been received according to Ending @ Symbol instead of the start symbol S and the length L included in the DCI or the length L, for example. Further, the PDSCH reception processing unit 232 checks whether or not the cross TTI is set by the PDCCH based on, for example, the NDI and the HARQ process number included in the DCI and the RV (for example, FIG. 9). In this case, when the cross TTI is set by the PDCCH, the PDSCH reception processing unit 232 sets the cross TTI based on the start symbol S, length L or Ending @ Symbol, NDI, HARQ process number, RV, and the like. The extracted data is extracted from the baseband signal. The processing for the cross TTI set by the PDCCH may be performed by the PDSCH reception processing unit 232 instead of the control unit 234.

Further, for example, when the cross TTI is set by the RRC message, the PDSCH reception processing unit 232 converts the subsequent part of the PDSCH into the baseband according to the PDSCH-Config (for example, FIG. 6) included in the extracted RRC message. Extract from signal.

The PDSCH reception processing unit 232 outputs the extracted data and the RRC message to the control unit 234.

The control unit 234 performs reception processing and transmission processing according to, for example, the RRC message output from the PDSCH reception processing unit 232.

(4) The control unit 234 outputs the data output from the PDSCH reception processing unit 232 to the application unit 240.

{Further, control section 234 outputs the uplink scheduling result output from PDCCH reception processing section 231 to mapping section 237.

{Furthermore, the control unit 234 outputs the data output from the application unit 240 to the PUSCH generation unit 235. Further, control section 234 generates an uplink control signal, and outputs the generated control signal to PUCCH generation section 236.

PUSCH generating section 235 outputs the data output from control section 234 to mapping section 237.

PUCCH generating section 236 outputs the control signal output from control section 234 to mapping section 237.

Mapping section 237 maps data and control signals to radio resources according to the uplink scheduling result output from control section 234. Mapping section 237 outputs the mapped data and the control signal to RF transmitting / receiving section 220 as a baseband signal.

Returning to FIG. 17A, for example, the application unit 240 performs a process related to the application on the data output from the baseband signal processing unit 230. Further, the application unit 240 generates data by performing a process related to the application, for example, and outputs the generated data to the control unit 234.

<7. Operation example>
Next, an operation example will be described. As the operation example, the operation example of <4.1> described above will be described first. Next, an operation example of <4.2> will be described. Finally, an operation example of <4.3> will be described.

<7.1 Operation example of setting cross TTI by RRC message when shifting PDCCH and PDSCH>
FIG. 18 is a flowchart illustrating an operation example of base station 100 in the case where a cross TTI is set by an RRC message when PDCCH and PDSCH are shifted.

The base station 100 and the terminal 200 complete the exchange of the RRC message, for example, according to the sequence shown in FIG. 5A, and the PDSCH-Config shown in FIG. 6 is held between the base station 100 and the terminal 200. Shall be. For example, the control unit 122 generates the PDSCH-Config shown in FIG. 6, and transmits the generated PDSCH-Config to the terminal 200 via the PDSCH generation unit 124.

As shown in FIG. 18, when starting the processing (S20), the base station 100 executes the LBT (S21). For example, the base station 100 performs the following processing.

That is, the received signal processing unit 121 measures the intensity of the received signal in a predetermined frequency band of the unlicensed frequency band, and outputs the result to the control unit 122. When the result is smaller than the threshold value, the control unit 122 determines that the state is “Idle”.

Next, the base station 100 determines whether or not the predetermined frequency band of the unlicensed frequency band is in the “Idle” state (S22). When in the “Busy” state (No in S22), the base station 100 executes the LBT again after a predetermined period has elapsed (S21), and repeatedly executes the LBT until the predetermined frequency band becomes the “Idle” state (No in S22). Loop).

When the predetermined frequency band becomes “Idle state” (Yes in S22), the base station 100 transmits the PDCCH and the PDSCH using the predetermined frequency band (S23). For example, the base station 100 performs the following processing.

{That is, when determining that the state is the “Idle” state, the control unit 122 instructs the mapping unit 125 to output the signal of the head slot (or head TTI). The control unit 122 detects that there is data to be transmitted, and instructs to generate a signal of the first slot before starting the LBT. First, data received from the transmission line interface 110 is output to the PDSCH generation unit 124. At that time, the control unit 122 performs scheduling and outputs the result to the PDCCH generation unit 123. PDCCH generating section 123 outputs DCI to mapping section 125, PDSCH generating section 124 outputs data to mapping section 125, and mapping section 125 maps DCI and data on radio resources according to the downlink scheduling result. I do. Mapping section 125 transmits the mapped DCI and data to terminal 200 via RF transmitting / receiving section 130.

However, for example, as shown in FIG. 4B, the base station 100 shifts the symbol including the PDCCH and the PDSCU until the state changes to the “Idle” state after the “Busy” state and then to the “Idle” state. Let it. Further, base station 100 transmits the portion of PDSCH that could not be transmitted in the first slot (or first TTI) in the next slot (or next TTI) using the cross TTI. For example, the base station 100 performs the following processing.

That is, the control unit 122 instructs the mapping unit 125 not to transmit the PDCCH and the PDSCH when the signal strength of the predetermined frequency band is equal to or more than the threshold, and the mapping unit 125 stops the transmission of the mapped PDCCH and the PDSCH. I do. Meanwhile, the mapping unit 125 may store the PDCCH and the PDSCH in the internal memory. After that, when the signal strength becomes smaller than the threshold value, the control unit 122 confirms that the unlicensed frequency band is not used by another device. Then, in this case, control section 122 shifts the symbols including the PDCCH and PDSCH in the downlink direction in the time direction until the transmission start timing at which the state becomes “Idle”. The control unit 122 also shifts the subsequent PDCCH and PDSCH in the time direction. In the example of FIG. 4B, the control unit 122 shifts by four symbols. Control unit 122 outputs the shifted result to mapping unit 125. Mapping section 125 reads the mapped PDCCH and PDSCH from the internal memory according to the shift result, and outputs the read PDCCH and PDSCH to RF transmitting / receiving section 130. After shifting, mapping section 125 or RF transmitting / receiving section 130 transmits the control signal and data to terminal 200 using PDCCH and PDSCH, respectively. Then, when performing the cross TTI according to the PDSCH-Config (for example, FIGS. 5A and 6), the control unit 122 maps the slot number for transmitting the untransmitted portion, the symbol number for starting the transmission, and the like to the mapping unit 125. Output to In accordance with the instruction, mapping section 125 reads out the untransmitted portion of TB # a stored in the internal memory or the like, and transmits it at the indicated symbol in the indicated slot. Thereby, for example, a cross TTI can be realized.

For example, when shifting the PDCCH and the PDSCH in the time direction, the control unit 122 determines the start symbol S and the length L included in the PDCCH from the start symbol included in the PDCCH when transmitting from the first symbol in the slot. S and length L are set to be the same.

<< Returning to FIG. 18, upon ending the transmission of the PDCCH and PDSCH, the base station 100 ends this processing (S24).

FIG. 19 is a flowchart illustrating an example of processing on the terminal 200 side in this operation example.

When the terminal 200 starts the process (S30), the terminal 200 receives the PDCCH and the PDSCH portion in the slot including the PDCCH. For example, the PDCCH reception processing unit 231 receives the PDCCH, and the PDSCH reception processing unit 232 receives the DCI from the PDCCH reception processing unit 231, and receives the PDSCH portion according to the DCI.

Next, the terminal 200 determines whether or not the actually received PDSCH length is shorter than the PDSCH length indicated by the DCI (S32). The DCI includes the start symbol S and the length L as described above. For example, the terminal 200 performs the following processing.

That is, the control unit 234 receives the data output from the PDSCH reception processing unit 232, counts the data amount of the data, and calculates the length of the PDSCH based on the counted data. Then, the control unit 234 determines whether the calculated length is shorter than the length L indicated by the DCI. The control section 234 checks whether or not the base station 100 has shifted and transmitted the PDCCH and the PDSCH included in the first symbol based on the DCI and the length of the actually received PDSCH.

When the length of the actually received PDSCH is shorter than the length of the PDSCH indicated by DCI (Yes in S32), terminal 200 determines whether or not cross TTI setting is set in the RRC message (S33). ). For example, when the control unit 234 determines that the calculated length is shorter than the length L indicated by the DCI, the control unit 234 determines whether or not a cross TTI is set in the RRC message received from the PDSCH reception processing unit 232 (for example, FIG. (1)) is determined.

If the terminal 200 has a cross TTI setting (Yes in S33), the terminal 200 receives the subsequent part of the PDSCH according to the RRC setting (S34). For example, when confirming the setting of the cross TTI, the control unit 234 receives a subsequent portion of the PDSCH at a timing such as the next TTI according to the IE included in the PDSCH-Config (for example, FIG. 6).

Next, the terminal 200 feeds back ACK or NACK according to the reception result (S35). For example, when the PDSCH including the continuation of the PDSCH can be normally received by the cross TTI, the control unit 234 generates an ACK and feeds back the ACK via the PUSCH generation unit 235 or the PUCCH generation unit 236. On the other hand, when the PDSCH including the PDSCH continuation part cannot be normally received due to, for example, the cross TTI, the control unit 234 generates a NACK and feeds back the NACK via the PUSCH generation unit 235 or the PUCCH generation unit 236. .

端末 Then, the terminal 200 ends a series of processes (S36).

On the other hand, when the cross TTI is not set as the RRC setting (No in S33), the terminal 200 proceeds to S35 without performing the cross TTI processing. In this case, terminal 200 feeds back ACK or NACK to the received PDSCH without performing cross TTI.

On the other hand, if the length of the PDSCH actually received is the same as the length of the PDSCH indicated by DCI (No in S32), terminal 200 proceeds to S35. In this case, the terminal 200 has received the PDSCH having the length L indicated by the DCI, and for example, has the same situation as that of FIG. 4A, and thus has received the PDSCH without performing the cross TTI processing. ACK or NACK is fed back.

<7.2 Operation example of setting cross TTI by RRC message when PUSCH shifts>
FIG. 20 is a flowchart illustrating an operation example on the terminal 200 side when the cross TTI is set by the RRC message when the PUSCH shifts. Also in this case, similarly to the above <7.1>, the base station 100 and the terminal 200 end the exchange of the RRC message (for example, FIG. 5A) and hold the PUSCH-Config (for example, FIG. 6) with each other. It is assumed that For example, the control unit 122 generates the PUSCH-Config illustrated in FIG. 6 and transmits the PUSCH-Config to the terminal 200 via the PDSCH generation unit 124 and the like.

When the terminal 200 starts the processing (S40), the terminal 200 executes the LBT (S41). For example, the terminal 200 performs the following processing.

That is, the PDCCH reception processing unit 231 or the PDSCH reception processing unit 232 measures the signal strength of the received signal in a predetermined frequency band of the unlicensed frequency band, and outputs the result to the control unit 234. The control unit 234 determines the “Idle” state or the “Busy” state based on the result, similarly to the control unit 122 of the base station 100.

When the predetermined frequency band is in the “Busy” state (No in S42), the terminal 200 executes the LBT again after the predetermined time has elapsed (S41), and repeats until the state becomes the “Idle” state (No loop in S42). .

When the predetermined frequency band is in the “Idle” state (Yes in S42), the terminal 200 transmits the PUCCH and the PUSCH to the base station 100 using the predetermined frequency band (S43). The terminal 200 performs, for example, the following processing.

{That is, when determining that the control unit 234 is in the “Idle” state, the control unit 234 outputs the data received from the application unit 240 to the mapping unit 237 via the PUSCH generation unit 235. The control unit 234 outputs the uplink scheduling result received from the PDSCH reception processing unit 232 to the mapping unit 237, generates a control signal, and outputs the control signal to the mapping unit 237 via the PUCCH generation unit 236. Mapping section 237 maps the control signal and the data onto the radio resource according to the uplink scheduling result. Mapping section 237 transmits the mapped control signal (PUCCH) and data (PUSCH) to base station 100 via RF transmitting / receiving section 220.

However, for example, as shown in FIG. 7B, when the terminal 200 goes to the “Idle” state after the “Busy” state, the terminal 200 shifts the symbols including the PUCCH and the PUSCH until the “Idle” state. . The terminal 200 transmits the portion of the PUSCH that could not be transmitted in the first slot (or the first TTI) in the next slot (or the next TTI) using the cross TTI. For example, the terminal 200 performs the following processing.

That is, control section 234 instructs mapping section 237 not to transmit the PUCCH and PUSCH when the signal strength of the predetermined frequency band is equal to or higher than the threshold, and mapping section 237 stops transmission of the mapped PUCCH and PUSCH. . In this case, mapping section 237 may store the PUCCH and the PUSCH in the internal memory. After that, when the signal strength becomes smaller than the threshold value, the control unit 234 confirms that the unlicensed frequency band is not used by another device. Then, control section 234 shifts the symbols including the PUCCH and PUSCH in the uplink direction in the time direction until the transmission start timing at which the state becomes “Idle”. The control unit 234 also shifts the subsequent PUCCH and PUSCH in the time direction. In the example of FIG. 7B, the shift is performed by four symbols. The control unit 234 outputs the shifted result to the mapping unit 237. Mapping section 237 reads the PUCCH and PUSCH from the internal memory according to the shift result, and outputs them to RF transmitting / receiving section 220. Mapping section 237 or RF transmitting / receiving section 220 transmits the control signal and data assigned to the shifted symbol to base station 100 using the PUCCH and PUSCH, respectively. Then, when performing a cross TTI according to the PUSCH-Config (for example, FIGS. 5A and 6), the control unit 234 transmits a slot number for transmitting an untransmitted portion, a transmission start symbol number, and the like to the mapping unit. 237. In accordance with the instruction, the mapping unit 237 reads an untransmitted portion (for example, TB # a in FIG. 7A) stored in an internal memory or the like, and transmits the read portion using the indicated symbol in the indicated slot. . Thereby, for example, it is possible to realize a cross TTI in the up direction.

Returning to FIG. 20, when the transmission of PUCCH and PUSCH ends, terminal 200 ends this processing (S44).

Note that when the terminal 200 does not transmit the PUCCH (for example, FIG. 7B), the process of S43 is a process of transmitting the PUSCH without transmitting the PUCCH.

FIG. 21 is a flowchart illustrating an example of processing on the base station 100 side in this operation example.

When the base station 100 starts the processing (S50), it receives the PUCCH and the PUSCH portion in the slot including the PUCCH (S51). For example, the received signal processing unit 121 extracts the PUCCH and PUSCH transmitted from the terminal 200 from the baseband signal according to the uplink scheduling result output from the control unit 122, and controls the extracted PUCCH and PUSCH. Output to the unit 122.

Next, the base station 100 determines whether or not the length of the PUSCH actually received is shorter than the length of the PUSCH indicated by DCI (S52). For example, the base station 100 performs the following processing.

{That is, the control unit 122 counts the data amount of the data received from the reception signal processing unit 121, and calculates the length of the PUSCH based on the counted data amount. Based on start symbol S and length L included in DCI, control section 122 checks whether PUSCH has been started from start symbol S and whether the calculated length is shorter than length L. Similarly to control section 122 of terminal 200, control section 122 determines whether or not terminal 200 shifts and transmits the PUCCH and PDSCH included in the first symbol in terminal 200 based on the DCI and the length of the actually received PUSCH. To make sure.

When the length of the actually received PUSCH is shorter than the length of the PUSCH indicated by DCI (Yes in S52), the base station 100 determines whether or not a cross TTI is set in the RRC message (S53). . For example, the control unit 122 makes a determination by confirming whether or not a cross TTI setting has been made (for example, 1 in FIG. 6) in the RRC message generated by itself.

When the cross TTI is set (Yes in S53), the base station 100 receives the subsequent part of the PUSCH according to the RRC setting (S54). For example, when confirming the setting of the cross TTI, the control unit 122 receives the subsequent part of the PUSCH in the next TTI or the like according to the IE included in the PUSCH-Config (for example, FIG. 6).

Next, the base station 100 instructs retransmission or transmission of new data by PDCCH according to the reception result (S55). For example, when the PUSCH including the succeeding part of the PUSCH has been normally received by the cross TTI, the control unit 122 transmits the PDCCH instructing the transmission of the new data to the terminal 200 via the PDCCH generation unit 123. On the other hand, for example, when the PUSCH including the PUSCH continuation part cannot be normally received due to the cross TTI, the control unit 122 transmits a PDCCH instructing retransmission to the terminal 200 via the PDCCH generation unit 123.

Then, the base station 100 ends a series of processing (S56).

On the other hand, when the cross TTI is not set as the RRC setting (No in S53), the base station 100 proceeds to S55 without performing the cross TTI processing. In this case, terminal 200 feeds back ACK or NACK to the received PUSCU without performing cross TTI.

On the other hand, when the length of the actually received PUSCH is the same as the length of the PUSCH indicated by the DCI (No in S52), the base station 100 proceeds to S55. In this case, the base station 100 has received the PUSCH having the length L indicated by the DCI. For example, since the situation is the same as that of FIG. 7A, the received PUSCH is not processed without performing the cross TTI processing. ACK or NACK is fed back.

In FIG. 21, when the terminal 200 does not transmit the PUCCH, in the process of S51, the base station 100 receives the PUSCH without receiving the PUCCH.

<7.3 Operation example of setting cross TTI by PDCCH when PDCCH and PDSCH shift>
FIG. 22 is a flowchart illustrating an operation example on the base station 100 side when a cross TTI is set by the PDCCH when the PDCCH and the PDSCH shift.

In performing this operation example, it is assumed that the base station 100 and the terminal 200 have finished exchanging RRC messages (for example, FIG. 5A) and mutually hold PDSCH-Config in a memory or the like. However, it is assumed that (1) in FIG. 6 is set in PDSCH-Config, and (2) to (4) are not set. That is, base station 100 and terminal 200 share whether or not to perform a cross TTI by exchanging RRC messages, and details of the cross TTI are set by the PDCCH.

In the process shown in FIG. 22, S60 to S62 are the same as S20 to S22 in FIG. 18 of <7.1> described above.

(4) When the unlicensed frequency band is in the “Idle” state (Yes in S62), the base station 100 transmits the PDCCH and the PDSCH (S23). As in the case of <7.1> described above, when the PDCCH and the PDSCH are shifted in the first slot, the base station 100 performs, for example, the following processing.

That is, when scheduling the first slot, the control unit 122 determines the TDRA, NDI, HARQ process number, RV, MCS and the like shown in FIG. 9 and outputs the determined information to the PDCCH generation unit 123. The PDCCH generation unit 123 collects these pieces of information and generates, for example, PDCCH #m illustrated in FIG. PDCCH generating section 123 transmits the generated PDCCH #m to terminal 200 via mapping section 125. Further, control section 122 sets a cross TTI for a PDSCH that could not be transmitted in the first slot due to the shift of the symbol including the PDCCH (PDCCH #m in the example of FIG. 10A) and PDSCH in the first slot. Therefore, a new PDCCH (PDCCH #n in the example of FIG. 10A) is generated. The control unit 122 generates the same NDI, HARQ process number, and RV as the NDI, HARQ process number, and RV included in the PDCCH (PDCCH # m) of the first slot. PDCCH generating section 123 generates a PDCCH (PDCCH # n) for setting a cross TTI including these pieces of information, and transmits the generated PDCCH to terminal 200 via mapping section 125 or the like. Note that PDCCH # m1 may be generated when PDCCH #m is generated. The transmission of the PDSCH by the cross TTI is the same as the above <7.1>.

FIG. 23 is a flowchart illustrating an operation example on the terminal 200 side when a cross TTI is set by the PDCCH when the PDCCH and the PDSCH shift.

23. In FIG. 23, S70 to S72 are the same as S30 to S32 in FIG. 19 described in <7.1> above. However, in S72, the DCI used in determining whether the length of the PDSCH actually received is shorter than the length of the PDSCH indicated by the DCI is, for example, the DCI included in the PDCCH of the first slot. In the example of FIG. 8B, this corresponds to DCI included in PDCCH #m.

When the length of the PDSCH actually received is shorter than the length of the PDSCH indicated by DCI (Yes in S72), terminal 200 determines whether or not a cross TTI has been set in the RRC setting (S73). . For example, the terminal 200 performs the following processing.

{That is, the control unit 234 calculates the length of the data from the data amount of the data output from the PDSCH reception processing unit 232, and determines that the length is shorter than the length L indicated by the DCI. Then, the control unit 234 checks the cross TTI setting ((1) in FIG. 6) in the PDSCH-Config included in the RRC message output from the PDSCH reception processing unit 232 to determine whether the cross TTI is set. judge.

When the cross TTI is set (Yes in S73), the terminal 200 receives the new PDCCH and receives the subsequent part of the PDSCH according to the resource assignment (S74). For example, the terminal 200 performs the following processing.

That is, the PDSCH reception processing unit 232 receives a new PDCCH from the PDCCH reception processing unit 231 and refers to each field shown in FIG. Then, the PDSCH reception processing unit 232 confirms the PDSCH of the “untransmitted” portion addressed to the own station according to the information indicated in each field, and determines the PDSCH portion following the PDSCH allocated by the PDCCH of the previous TTI. Receive.

Next, the terminal 200 feeds back ACK or NACK according to the reception result (S75). For example, the control unit 234 determines whether or not the data received from the PDSCH reception processing unit 232 is normal, generates ACK or NACK according to the determination result, and outputs the ACK or NACK via the PUSCH generation unit 235 or the PUCCH generation unit 236. This is fed back to the base station 100.

{Terminal 200} ends the series of processing (S76).

On the other hand, when the length of the PDSCH actually received is equal to the length of the PDSCH indicated by the DCI (No in S72), or when the terminal 200 is set not to perform the cross TTI in the RRC setting ( (No in S73), the process proceeds to S75 and performs the above-described processing.

<8. About Search Space>
A supplementary description of the first embodiment will be given.

$ 5G has a ControlResourceSet (CORESET) as an RRC message. CORESET is used to set time and frequency control resources, for example, to search for DCI. An IE included in CORESET is frequencyDomainResources. frequencyDomainResources represents, for example, frequency resources for DCI search.

Also, 5G has a SearchSpace (search space) as an RRC message. The SearchSpace indicates, for example, how to search for a PDCCH candidate, or where to search for a PDCCH candidate. Both the RESET and the SearchSpace are, for example, information elements or messages included in the RRCReconfiguration message.

FIG. 24A is a diagram illustrating an example of transmission of a PDCCH and a PDSCH including a search space, for example. One or more PDCCHs are included in the search space. For example, terminal 200 searches for a region to which the PDCCH is allocated on the radio resource according to the SearchSpace that is an RRC message. Some PDCCHs notify the individual terminals 200 and others notify the system common or multiple terminals. For example, information on a format such as the length of a transmission burst or the length of the next slot, or information on an uplink transmission section, the slot number of the slot in which the PDCCH is located in a transmission burst (for example, the number is set to 0 for the first slot, The terminal 200 also searches for a PDCCH that transmits information common to the system such as counting.

SearchSpace includes each of the following: IE of monitoringSlotPeriodicityAndOffset, monitoringSymbolsWithinSlot, and duration.

The $ monitoringSlotPeriodicityAndOffset is, for example, an IE indicating in which slot the search space is once. For example, when the monitoringSlotPeriodicityAndOffset is “all slots”, search slots are included in all slots.

MonitoringSymbolsWithSinSlot is, for example, an IE indicating a symbol to which a PDCCH may be transmitted (or a PDCCH can be transmitted) in a slot. monitoringSymbolsWithinSlot is defined by, for example, an absolute position in a slot. For example, when monitoringSymbolsWithSinSlot is “1000000010000000”, as shown in FIG. 24A, it indicates that the PDCCH is allocated to the first and eighth symbols in the slot.

Duration is, for example, an IE indicating a length in the time direction. For example, when the duration is “2”, it indicates that the PDCCH has a length of “2” symbols, as shown in FIG.

For the search space area, for example, the resource specification in the time direction of the PDCCH can be performed by each of the IE of monitoringSlotPeriodicityAndOffset, monitoringSymbolsWithinSlot, and duration. Then, the terminal 200 that has received such an RRC message can monitor the area on the radio resource and receive the PDCCCH according to each of these IEs.

In the first embodiment, for example, as shown in FIG. 24B, a symbol including the PDCCH and the PDSCH can be shifted in the time direction according to the result of carrier sense. There will be a transmission opportunity. In this case, the problem is how to define the resources in the search space in the time direction. In particular, since monitoringSymbolsWithinSlot defines a symbol at an absolute position in a slot, for example, how to handle it becomes a problem.

Here, focusing on the subsequent slots other than the first slot in FIG. 24B, the position of the search space is the same as the position of the search space in the license frequency band. Therefore, the search space in the subsequent slot of the unlicensed frequency band and the search space of the licensed frequency band can be monitored in common. On the other hand, the monitoring method for the search space in the first slot is performed in a different manner from the monitoring method for the search space in the license frequency band.

Therefore, in the first embodiment, a search space monitoring method is defined by two options. The first option (Option 1) defines two monitoring Symbols With Slot with a subsequent slot and a leading slot. The second option (Option 2) is a method of changing the interpretation and processing in the terminal 200 with the same definition for monitoringSymbolsWithSinSlot in the subsequent slot and the leading slot.

FIG. 25 is a diagram illustrating a definition example of two options (Option 1 and Option 2). In FIG. 25, for example, “Slot after 2 slots of transmission burst” represents a succeeding slot (for example, a slot from the first slot to the next slot), and “slots other than those described on the left” represent a top slot, respectively. The “slots other than those described in the left” include, for example, slots in a data non-transmission section before the first slot.

In the example shown in FIG. 25, in Option 1, monitoring Symbols WithoutSlot is defined by a method different from “1000000000000” in the succeeding slot and “10101010101010” in the leading slot. That is, in Option 1, for example, the content included in monitoringSymbolsWithinSlot is different between “Slot after 2slot of transmission burst” and “slot other than those described on the left”.

では In this example, in the succeeding slot, it indicates that there is a search space at the first symbol (first symbol). Therefore, terminal 200 may search for the leading slot in the subsequent slot.

In the first slot, the first symbol (Symbol # 0), the third symbol (Symbol # 2), the fifth symbol (Symbol # 4), and the like are monitored seven times every other symbol from the beginning. . Therefore, terminal 200 only needs to monitor the head slot seven times with the specified symbol.

In the case of Option 1, the RRC message includes, for example, two definitions as shown in FIG. 25 for monitoringSymbolsWithinSlot, and the terminal 200 can perform such processing by receiving the RRC message.

On the other hand, in the example shown in FIG. 25, in Option 2, the monitoring Symbols WithoutSlot is “100000000000000000” for both the succeeding slot and the leading slot. In this case, terminal 200 interprets the parameter indicated by monitoringSymbolsWithSlot as the relative position of each transmission opportunity from the actual transmission start symbol. For example, in the example of FIG. 24B, in the first slot, transmission is actually started from the fifth symbol, so that the terminal 200 determines that the fifth symbol is the first “1” -th in “1000000000000”. Interpret as a symbol.

ＯIn Option 2 in FIG. 25, similarly to Option 1, monitoringSymbolsWithSinSlot is included in the RRC message, so that the terminal 200 can receive the RRC message and perform such processing.

In Option 2, “Symbol # 0, # 2, # 4, # 6, # 8, # 10, # 12” may be set as the transmission start pattern by the RRC message.

FIG. 26 is a diagram illustrating an example of an RRC message including a transmission start pattern. The example illustrated in FIG. 26 is an example in which the IE of “PDCCH transmission available timing” is included in the PDSCH-Config. By setting, for example, “1010101010101010” as a parameter to be set in “PDCCH transmission available timing”, “Symbol # 0, # 2, # 4, # 6, # 8, # 10, # 12” of the first slot is transmitted. At this time, the terminal 200 may monitor the PDCCH at this timing.

The “PDCCH transmittable timing” may be included in the PDCCH-Config, or may be included in another Config or the like. The “PDCCH transmission available timing” may be any timing included in, for example, the RRCReconfiguration message.

For Option1 and Option2, for example, the control unit 122 of the base station 100 may generate an RRC message including monitoringSymbolsWithinSlot, and transmit the generated RRC message to the terminal 200 via the PDSCH generation unit 124.

FIG. 27A and FIG. 27B are diagrams illustrating an example of monitoring of the terminal 200 when Option 1 and Option 2 illustrated in FIG. 25 are set.

As shown in FIG. 27A, in the untransmitted section, the terminal 200 performs monitoring every other symbol from the first symbol in the slot by the monitoringSymbolsWithinSlot in Option1 and the RRC message in Option2.

Terminal 200 monitors the first symbol of the first slot of the transmission burst, receives the PDCCH, and thereafter also receives the PDSCH.

In the case of Option 1, the terminal 200 can receive the PDCCH by monitoring the leading slot by monitoringSymbolsWithSinSlot (= “10101010101010”).

In the case of Option 2, the terminal 200 can receive the PDCCH by monitoring the first symbol based on the “transmission start timing” of the RRC message. In this case, terminal 200 interprets “1” of “1000000000000” in monitoringSymbolsWithinSlot as the first symbol as the transmission start symbol.

Note that, for the second and subsequent slots of the transmission burst, the terminal 200 only needs to monitor the first slot in the slots for both Option 1 and Option 2 as subsequent slots.

On the other hand, in the example of FIG. 27B, in the first slot of the transmission burst, reception of the PDCCH and PDSCH starts from the fifth symbol. In Option 1, terminal 200 receives the PDCCH from the fifth symbol by monitoring every other symbol from the first symbol by monitoringSymbolsWithinSlot. In Option 2, the terminal 200 monitors every other symbol from the first symbol and receives the PDCCH from the fifth symbol according to the “transmission start timing” of the RRC message. At this time, the terminal 200 interprets the fifth symbol (symbol 4) as "1" of "1000000000000" in monitoringSymbolsWithSinSlot.

[Other embodiments]
FIG. 28A is a diagram illustrating a hardware configuration example of the base station 100.

The base station 100 includes a processor 160, a main storage device 161, a network interface 162, an auxiliary storage device 163, a wireless device 164, and an antenna 140.

The processor 160 reads out the program stored in the main storage device 161 and loads it into the auxiliary storage device 163, and executes the loaded program to realize the function of the baseband signal processing unit 120. The processor 160 corresponds to, for example, the baseband signal processing unit 120 according to the first embodiment.

The network interface 162 corresponds to, for example, the transmission line interface 110 in the first embodiment. Further, the wireless device 164 corresponds to, for example, the RF transmitting / receiving unit 130 in the first embodiment.

FIG. 28B is a diagram illustrating an example of a hardware configuration of the terminal 200.

The terminal 200 includes a processor 260, a main storage device 261, a screen display device 262, an auxiliary storage device 263, a wireless device 264, and an antenna 210.

The processor 260 reads the program stored in the main storage device 261, loads the program into the auxiliary storage device 263, and executes the loaded program to realize the functions of the baseband signal processing unit 230 and the application unit 240. The processor 260 corresponds to, for example, the baseband signal processing unit 230 and the application unit 240 in the first embodiment.

The wireless device 264 corresponds to, for example, the RF transmitting / receiving unit 220 in the first embodiment.

The screen display device 262 displays an image by executing an application under the control of the processor 260, for example.

The

processors

160 and 260 may be, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), an FPGA (Field-Programmable Gate Array), a DSP (Digital Processing Unit), or the like.

In the first embodiment, the example has been described in which the base station 100 and the terminal 200 perform carrier sensing in units of two symbols, for example, and there are seven transmission opportunities in one slot. For example, when the base station 100 and the terminal 200 perform carrier sensing in units of one symbol, transmission opportunities exist 14 times in one slot. Then, an example has been described in which base station 100 and terminal 200 shift, for example, in symbol period units. For example, the base station 100 or the terminal 200 may shift the first symbol by a period unit (or time unit) shorter than the symbol period. Alternatively, the shift unit may be an integral multiple of the symbol, and the transmission start timing may be in the middle of the symbol period. In this case, the control unit 122 of the base station 100 or the control unit 234 of the terminal 200, for example, copies data or a signal included in the head symbol and shifts the copied data or signal to the head symbol when shifting the head symbol. On the other hand, by adding the information forward in time, transmission from the middle of the symbol period becomes possible. In a case where the search space is not set at the first symbol of the slot in downlink transmission from base station 100, or in the case of uplink transmission from terminal 200, transmission may be started from the middle of the first symbol in synchronization with the transmission start timing.

In the first embodiment, an example has been described in which data, DCI, RRC message, and HARQ-ACK are all transmitted using a predetermined frequency band of the unlicensed frequency band. The wireless system 10 communicates using both the licensed frequency band and the unlicensed frequency band, and transmits some or all of DCI, RRC messages, and HARQ-ACK related to data transmission in the unlicensed frequency band using the licensed frequency band. May be sent.

10: Wireless communication system 100: Base station device (base station)
110: Transmission path interface 120: Baseband signal processing unit 121: Received signal processing unit 122: Control unit 123: PDCCH generation unit 124: PDSCH generation unit 125: Mapping unit 130: RF transmission / reception unit 140: Antenna 160: Processor 200 (200) -1,200-2): Terminal device (terminal)
210: antenna 220: RF transmitting / receiving unit 230: baseband signal processing unit 231: PDCCH reception processing unit 232: PDSCH reception processing unit 234: control unit 235: PUSCH generation unit 236: PUCCH generation unit 237: mapping unit 240: application unit 260 : Processor

Claims

In the transmitting device capable of wireless communication with the receiving device using the first frequency band which does not require a license,
Confirm that the first frequency band is not used by another transmitting device, and a first symbol including a first control channel and a first shared channel in a first communication direction, or the first symbol A control unit configured to shift a second symbol including a second shared channel in a second communication direction different from the one communication direction in a time direction;
The first control signal and the first data assigned to the first symbol are assigned using the first control channel and the first shared channel, respectively, or assigned to the second symbol. A transmitting unit that transmits second data to the receiving device using the second shared channel.
The control unit, wherein the first frequency band is used by the other transmission device, and the first control signal and the first data or the second data are transmitted from a first symbol in a slot. The transmitting apparatus according to claim 1, wherein when the first symbol or the second symbol cannot be obtained, the first or second symbol is shifted in the time direction from the first symbol.
The control unit, when shifting the first control signal and the first data from the first symbol in the slot and transmitting the first control signal and the first data, starts the first data included in the first control signal in the slot. A symbol and a length from the start symbol in a slot of the first data included in the first control signal when the first control signal and the first data are transmitted from the first symbol. The transmission apparatus according to claim 1, wherein the transmission symbol is set to a start symbol and a length from the start symbol.
The first control signal includes a start symbol and a length from the start symbol,
The transmitting apparatus according to claim 1, wherein the start symbol is a symbol that has actually started transmission of the first data.
The transmission apparatus according to claim 1, wherein the control unit shifts the first or second symbol in a time direction by a unit of a symbol period or by a period shorter than the symbol period.
The transmission unit,
Transmitting a part of the first data that cannot be transmitted in the first period allocated by the first control signal in a second period allocated by the third control signal; or ,
Transmitting a part of the second data that could not be transmitted in the third period allocated by the first control signal in a fourth period allocated by the fourth control signal. The transmitting device according to claim 1, wherein
The control unit, wherein the first frequency band is used by the other transmission device, and the first control signal and the first data or the second data are transmitted from a first symbol in a slot. Is not possible, when it is not possible to transmit all of the first or second data in the first or second period allocated by the first control signal, respectively, 2 to transmit a part of the data in the second or fourth period, respectively.
The transmission device according to claim 6, wherein the transmission unit transmits a part of the first or second data in the second or fourth period, respectively, in accordance with the instruction.
The transmitting unit transmits a part of the first or second data that could not be transmitted in the first or third period included in the first slot period, respectively, in the first slot period. 7. The transmitting apparatus according to claim 6, wherein transmission is performed in each of the second and fourth periods included in a second slot period that is a next slot period.
The transmitting unit transmits a first message instructing to transmit a part of the first or second data in the second or fourth period using the first shared channel. The transmitting device according to claim 6, wherein
An information element indicating whether or not the first data is transmitted in the first and second periods or whether the second data is transmitted in the third and fourth periods; An information element indicating a slot number for transmitting a part of the first or second data, a symbol number of a symbol for starting transmission of a part of the first or second data, 10. The transmitting apparatus according to claim 9, wherein the first message further includes an end symbol of the slot of (i) and an information element indicating whether or not to shift in the next slot.
10. The transmission apparatus according to claim 9, wherein the first message is a PDSCH (Physical Downlink Shared CHannel) -Config or a PUSCH (Physical Uplink Shared CHannel) -Config included in an RRCReconfiguration message.
The first control channel and the first shared channel are PDCCH (Physical Downlink Control CHannel) and PDSCH (Physical Downlink Shared CHannel), respectively, and the second shared channel is PUSCH (Physical Uplink Control CHannel). The transmitting device according to claim 9, wherein:
The said transmission part transmits the 5th control signal which instruct | indicates transmitting a part of said 1st data in the said 2nd period using the said 1st control channel, The said control part, The said control part is characterized by the above-mentioned. 7. The transmission device according to 6.
The fifth transmission unit includes an NDI (New Data Indicator), an HARQ (Hybrid Automatic Repeat Repeat request) process number, and an NDI, HARQ process number, and RV that are respectively the same as the RV included in the first control signal. 14. The transmitting device according to claim 13, which transmits a control signal.
The transmission unit transmits the first control signal in a first slot period, and transmits the fifth control signal and a part of the first data to a second control signal in a second slot next to the first slot period. 14. The transmission device according to claim 13, wherein transmission is performed during a slot period.
The control unit transmits another control signal including the fifth control signal to an area of a first radio resource for transmitting a part of the first data allocated by the fifth control signal. 14. The transmitting apparatus according to claim 13, wherein when the area of the second radio resource is included, a part of the first data allocated to the area of the second radio resource is punctured.
14. The transmitting apparatus according to claim 13, wherein the first control channel and the first shared channel are a PDCCH (Physical Downlink Control CHannel) and a PDSCH (Physical Downlink Shared CHannel), respectively.
The transmitting unit transmits a second message including an end symbol indicating a symbol at which transmission of the first data ends in a slot using the first shared channel, or a sixth message including the end symbol. The transmission device according to claim 1, wherein a control signal is transmitted using the first control channel.
19. The transmission apparatus according to claim 18, wherein the second message is a PDSCH (Physical Downlink Shared CHannel) -Config or a PUSCH (Physical Uplink Shared CHannel) -Config included in an RRCReconfiguration message.
19. The transmission according to claim 18, wherein the transmission unit transmits the sixth control signal including the end symbol using the first control channel instead of the length from the start symbol. apparatus.
The transmitting unit transmits a third message including an information element representing a symbol capable of transmitting the first control signal in a slot using the first shared channel,
The third message includes a content of the information element in a slot after a second slot after the first slot that has started transmission of the first data, and a slot other than a slot after the second slot. The transmission device according to claim 1, wherein the third message having a content different from the content of the information element is transmitted.
22. The transmitting apparatus according to claim 21, wherein the information element is monitoringSybolsWithInSlot.
The transmitting unit transmits a third message including an information element representing a symbol capable of transmitting the first control signal in a slot using the first shared channel,
The symbol capable of transmitting the first control signal is represented by a relative position from a symbol that has actually started transmitting the first control signal,
The transmitting device according to claim 1, wherein the transmitting unit transmits a fourth message including a symbol indicating a transmission opportunity of a first control signal using the first shared channel.
24. The transmitting apparatus according to claim 23, wherein the information element is monitoringSybolsWithInSlot.
The transmitting device is a base station device, the receiving device is a terminal device, or
The transmission device according to claim 1, wherein the transmission device is a terminal device, and the reception device is a base station device.
The second symbol includes a second control channel;
The transmitting unit transmits the second data and the second control signal assigned to the second symbol to the receiving device by using the second shared channel and the second control channel, respectively. The transmission device according to claim 1, wherein
27. The transmitting apparatus according to claim 26, wherein the second control channel is a PUCCH (Physical Uplink Control CHannel).
In the receiving device capable of wireless communication with the transmitting device using the first frequency band that does not require a license,
The first control signal and the first data assigned to the first symbol are used for the first control channel and the first shared channel, respectively, or the second data assigned to the second symbol. Using a second shared channel, receiving from the transmitting device,
The first symbol including the first control channel and the first shared channel in a first communication direction according to the first control signal and the first data or the second data; Or a control unit for confirming that the second symbol including the second shared channel in a second communication direction different from the first communication direction has been shifted in the time direction. Receiver.
The control unit may be configured such that the first or second symbol is shifted according to a start symbol in a slot and a length from the start symbol of the first data included in the first control signal. 29. The receiving device according to claim 28, wherein:
The receiving unit,
Receiving a part of the first data that could not be received in the first period assigned by the first control signal in a second period assigned by a third control signal; or ,
Receiving a part of the second data that could not be received in the third period allocated by the first control signal in a fourth period allocated by the fourth control signal. The receiving device according to claim 28, wherein:
The receiving unit,
Receiving, using the first shared channel, a first message indicating that a part of the first or second data is to be transmitted in the second or fourth period; or
Receiving, using the first control channel, a fifth control signal instructing to transmit a part of the first data in the second period;
The said receiving part receives a part of the said 1st data in the said 2nd or 4th period by the said 1st message or the said 5th control signal. The said Claim 30 characterized by the above-mentioned. Receiver.
A transmitting device;
With a receiving device,
In the wireless communication system in which the transmitting device and the receiving device can perform wireless communication using a first frequency band that does not require a license,
The transmission device,
Confirm that the first frequency band is not used by another transmitting device, and a first symbol including a first control channel and a first shared channel in a first communication direction, or the first symbol A control unit configured to shift a second symbol including a second shared channel in a second communication direction different from the one communication direction in a time direction;
The first control signal and the first data assigned to the first symbol are assigned using the first control channel and the first shared channel, respectively, or assigned to the second symbol. A transmitting unit for transmitting second data to the receiving device using the second shared channel,
The receiving device,
The first control signal and the first data are respectively used by using the first control channel and the first shared channel, or the second data is used by using the second shared channel, respectively. And a receiving unit for receiving from the transmitting device.
A communication method in a transmission device that has a control unit and a transmission unit, and that can perform wireless communication with a reception device using a first frequency band that does not require a license,
The control unit confirms that the first frequency band is not used by another transmission device, and includes a first symbol including a first control channel and a first shared channel in a first communication direction. Or shifting a second symbol including a second shared channel in a second communication direction different from the first communication direction in a time direction;
The transmitting unit transmits a first control signal and first data assigned to the first symbol using the first control channel and the first shared channel, respectively, or the second control signal and the first shared channel. A communication method comprising: transmitting second data assigned to a symbol to the receiving device using each of the second shared channels.